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7.15.8.23 The corresponding pilot lamp in II does not activate when the parking
brake is on.
) Check operability of the hand brake S 5 lamp switch for which it is required to
remove the socket from the switch and lock the wire for tractor “load”. If the lamp activates
– replace the switch.
b) If the lamp does not activate, check the electrical circuit operability from the
switch to II for presence of breakages. In case there is a breakage – eliminate it.
c) If the circuit operates properly (there are no breakages) – replace or send II P1 to
the repair shop.
7.15.8.24 The pilot lamp in II does not activate when the upper beam lights are on.
) If the lights upper beam is on – it means the fuse “A” (25 ) in the fuse block F5 op-
erates properly. It is required to check the electrical circuit operability from the fuse to the II
1. In case there are circuit breakages – eliminate them.
b) If the electrical circuits operate properly, replace or send II P1 to the repair shop.
7.15.8.25 Pilot lamps in II do not activate when tractor or alarm signaling turn indica-
tors are on, but sections of turn indicators on front and rear lights operate properly.
) Check the electrical circuit operability from the turn relays (
1) to the pilot lamps
of tractor and trailer turn indicators. If the circuit is broken – eliminate the failure.
b) If the circuit operates properly – replace or send II P1 to the repair shop.
7.15.8.26 The pilot lamp of emergency oil pressure in the HSC on PLU does not ac-
tivate when the engine is not running.
) Check sensor operability of emergency oil pressure in the HSC SP3 for which it
is required to disconnect the wire from the sensor and lock for tractor “load” for a short pe-
riod. In case the lamp activates – replace the sensor. If the lamp does not activate – check
the electrical circuit operability sensor SP3 – pilot lamp PLU HG1 for presence of break-
ages. If the circuit is broken – eliminate the failure.
b) Check availability of supply voltage of PLU on the connecting socket XS13.1 of
the pilot lamps unit HG1. If there is no voltage, check the electrical circuit operability from
HG1 to the fuse block F4.
c) If the sensor SP3 and the electrical circuit of supply PLU HG1 and the circuit
sensor SP3 – pilot lamps unit HG1 operate properly (there is no breakage) – replace the
pilot lamps unit.
7.15.8.27 The pilot lamp in the pilot lamps unit HG1 does not activate when the
RADL is on.
Check availability of “load” on PLU and the electrical circuit operability from PLU to
the slot XS9.6, check if PLU operates properly. If PLU and the abovementioned circuits
operate properly, carry out the repair of DL ECS. The ECS diagram of DL, FDA and GB
reduction gear is given in Annex A.
7.15.8.28 The pilot lamp of air filter clogging in the pilot lamps unit HG1 activates
when the filter is cleaned.
) Check sensor operability of air filter SP1 clogging for which it is required to dis-
connect the wires from the sensor. If the lamp goes out – replace the sensor. If the lamp
does not go out, check the circuit operability in the system sensor – pilot lamp PLU HG1
for presence of locking on tractor body. If the circuit is short cut – eliminate the failure.
b) In case the sensor SP1 and the electrical circuit sensor SP1– pilot lamp PLU
HG1 operate properly (there are no short cuts) – replace the pilot lamps unit.
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